Selector



March 17, 1925.

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1,529,953 c. A. w. HULTMAN SELECTOR Filed May 16, 1922 2 Sheets-Sheet 1 March 17, 1925 1,529,953

c. A. w. HULTMAN SELECTOR Filed May 1s, 1922 2 sheets-sheet 2 Patented Mar. 17, i925.

cent AXEL WlLHELM HULTMAN, or nJUasHotnswnn-EN',

Application led May 16, 1922. Serial No. 561,413.

T0 all whom 'it may comer/nf 4 Be 1t ltnown that I, Cani, AXEL lVILHnLM HULTMAN, chiefl engineer, subject of the King ot Sweden, residing at Djursholm, Sweden, have invented certain new and useful Improvements in Selectors, of which the following is a specilication.

This invention relates to improvements inl selectors of the type used in automatic telephone systems as described in my prior United States Patent No. 1,431,116. -The movements of such a selector are controlled by an impulse sender preferably attached to the selector itself and by an impulse receiver such as known registers controlled by the impulses'conveyed. The invention has for its object to increase the sate operation ot similar systems by decreasing the number of impulses necessary to set the register to half the number of positions of said selector. For this purpose the arrangement of the selector is such that it sends impulses only at every second position, while the register moves one step at the closing and a further step atthe opening ot the impulse circuit.

The invention -will be further described with reference to the accompanyingv drawing, in which- Figs. 12L and 1b and Iiig. 2 shows the impulse receiver.

In the embodiment shown in Fig. 1 the selector is assumed to be provided with an impulse sender comprising an impulsefmedium IS moving with the selector and a Contact spring IK co-operating with the impulse medium, which latter consistsl ot a contact bar running in the direction ot the selcctors movement, in case this is linear, or of a disc adapted on the rotating shaft of the selector, in case this latter one rotates. The `contact spring IK is actuated by projections IT in the bar IS ot a numloer halt of that of the positions ot the selector, that is at the positions 1, 3, 5, and so on. The selector is also provided with a stop-work consisting ot a stop-bar SS provided with rectangular notches and a catch SH. The stop-work is so designed' as to stop the selector at each position 1, 2, '3, and so on.

It is assumed that the selector in this case' is ot the machine-driven type. The connecting and disconnecting of the selector is accomplished in a knownimanner by means show a sim )lined wirinoV of an electromagnet KM. The setting of the selector is controlled by a number of reg ister switches R'Sl, KS2, corresponding to the figures ot' the different subscribers, and a number of impulse receivers IMj, IM2.

The register switches are set in a known manner `:trom the subscribers or the operatorvs place in correspondence to the wantedsubscribers ligure. the other hand are set by impulses sent from the selector with the aid of an 'im-` pulse-relay IR. RK, and RK2 arethe sets of contacts belonging to the registerswitches, and IK1 and IK2 are the sets ot contacts belonging to theimpulse receivers.

The impulse receivers on The sets of contacts RKl, RK, and IKl are" connected to one another as shown in the drawing, while the set IK2 `is connectedto other register switches not shown. embodiment shown the 'selector is vassumed to haveY 25 setting positions in the first direction ot' movement, causing the impulse receiver to be provided also with Q5 contacts, divided in three groups. yThe sets:

of contacts tor the register switches andthe impulse receivers comprise contact-bars KS1hKS5, againstwhich the movable contacts ,slide in suchway Vthat these bars at every setting position are electrically con` nected` to the contact which corresponds to the lsetting position in question.

The design of the impulse.receivers `is shown in Fig`. The movable contacts SK are connected to a rotatable shaft VA carry` ing a catch-segment ST with notches cooperating with adouble-catchDII. This' catch is rotatable around a pin HT and is actuated by a spring I-IF in such way that the segment ST normally is caught by one tooth of the double-catch. The double` catch is actuated by a magnet IM through the armature MA, rotatable at MT. The

movement ot the Contact SK vis performed.

by the helical spring KF, which is attached to the stand MS with one end, and with the other end to and wound around a rollv by the one tooth ot the catch DI-I, whereby the` contact springs SK .through the action of the' springv KF `are moved forward'one In the` CII tromagnet IM;v Since the movable contacts are yset the resettingof same is accomplished by a special resetting mechanism not shown,

which acts upon the projection AV 'of thek catch-segment ST so that this latter one is moved back toits `normal position.

Since the setting 'of the register switches RSl, RSi and so on has been accomplished, the setting ot' the selector'k is 'performed in the following manner. The contacts SO, SO2', SO3 are iirst closed through they action Otl a sequence switch not shown', or the like, as generally used for controlling the connections in an automatic telephone exchange with machine driven selectors. Thereby a circuit 11 is closed through a stop magnet SM, which attracts its armature causing the catch SIrIto release. The catch SI-I thereby closes a circuit 12 over the magnet KM causing the selector to start. During the movement impulses of currents are sent out at. every second setting position 'over the circuit 13 including Ithe impulse relay IR, This latter one closes and opens in accordance thereto a local circuit 14 for the impulse receiver IM1, whichthus is set step by step, until its i'iiovable contacts reach a contact making position, when a circuit 15 is closed over the contacts in the register switches, upon which these-latter ones are set. In the circuit 15 a stop relay SR is connected, which now comes in action and opens the circuit 11, thereby causing the stop magnet SM to release its armature and the catch SH. The circuit 12 for the selectors coupling magnet KM. remains closed until the catch SI-I has reached its y'catching position in a notch in the bar SS, whereby thecontactTKL-is opened, the magnet KM disconnected, and lthe selector stopped. yhen the relay SR attracts its armature it connects itself into a holding lcircuit over the Contact K2 and acts upon a contact K3 which causes the impulse receiver IM, to be released and the impulse receiver IM2 to be connected to the lo'cal circuit .influenced by th'e impulse relayY IR. At the next movement of the selector its impulses are received by the impulse receiver IMQ, which thereby is set in the same way as ther impulsoreceiver IMD and tlie selector is set in the manner above described. l

Should the stop relay SR become actu ated iii suoli position ol the impulse receiver which corresponds to a circuit closing through its electroiiiagnet, the circuit vwill immediately become opened by this 'electromagnet at the contact KH. whereby the movable contacts of the impulse receiver are moved forward another step. Thereby the the stop relay SR is nevertheless lte'pt alive over the c'ontact K2, so that a'r'enewe'd starting of the selector is prevented.

That I claim as new and desire to secure by Letters Patent oi the United States ot America isr- 1 In automatic or semi automatic telephone systems a selector having an impulse sending device, a register responsive to impulses from said device and governing the advancement ot' said selector, the in'ipulsc sending device being so arranged that a new in'ipuls'cl is sent out only at every s'e'co'nd position o't' the selector and the register is moved one In testimony whereoic I affix my signature.

cARLpAxL wiiiisilvi HULTMAN. 

